Bis(creatininium) tetra-chlorido-cadmate(II).

In the title compound, (C(4)H(8)N(3)O)(2)[CdCl(4)], the asymmetric unit comprises two creatininium cations and one tetra-chloridocadmate anion. Cd⋯O secondary bonding links one of the two imidazole rings and the anion into ion pairs. The free and bound cations form layers between which the [CdCl(4)](2-) anions are sandwiched.

3,4-Dimethyl-anilinium chloride monohydrate.

The crystal structure of the title compound, C(8)H(12)N(+)·Cl(-)·H(2)O, consists of hydro-phobic layers of dimethyl-anilinium cations parallel to the bc plane alternated by hydro-philic layers of chloride anions and water mol-ecules. The layers are linked by N-H⋯O and N-H⋯Cl hydrogen bonds involving the ammonium groups of the cations. The cohesion of the ionic structure is further stabilized by O-H⋯Cl hydrogen-bonding inter-actions.

tert-Butyl N-[N,N-bis-(2-chloro-ethyl)sulfamo-yl]-N-(2-chloro-ethyl)carbamate.

The title compound, C(11)H(21)Cl(3)N(2)O(4)S, was produced as part of a development programme of a new synthetic route to chloro-ethyl-nitro-sosulfamides (CENS) with three chloro-ethyl moieties. These compounds possess structural features that confer potential biological activity and act as alkyl-ating agents. The packing is governed by four weak C-H⋯O inter-actions, forming an infinite three-dimensional network.

Poly[tetraaqua-μ(4)-squarato-di-μ(3)-squarato-disam-arium(III)].

The structure of the title compound, [Sm(2)(C(4)O(4))(3)(H(2)O)(4)](n), consists of infinite-chain structural units, built from edge-sharing samarium SmO(7)(H(2)O)(2) polyhedra and linked via bis-monodendate squarate (sq1) groups. The chains extend along [100] in a zigzag mode and are interconnected by bis-chelating squarate (sq2) ligands into layers parallel to (101). Inter-layer hydrogen bonds strengthen the cohesion of the three-dimensional network.